642743741 has 4 divisors (see below), whose sum is σ = 642950112. Its totient is φ = 642537372.

The previous prime is 642743729. The next prime is 642743743. The reversal of 642743741 is 147347246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 642743741 - 2¹⁰ = 642742717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642743695 and 642743704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642743743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98441 + ... + 104766.

It is an arithmetic number, because the mean of its divisors is an integer number (160737528).

Almost surely, 2^642743741 is an apocalyptic number.

It is an amenable number.

642743741 is a deficient number, since it is larger than the sum of its proper divisors (206371).

642743741 is a wasteful number, since it uses less digits than its factorization.

642743741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206370.

The product of its digits is 112896, while the sum is 38.

The square root of 642743741 is about 25352.3912284423. The cubic root of 642743741 is about 863.0036225846.

The spelling of 642743741 in words is "six hundred forty-two million, seven hundred forty-three thousand, seven hundred forty-one".